On the Discharges Inside a Micro‐Channel Stimulated by an Atmospheric Pressure Plasma Jet

ABSTRACT This work systematically investigates the properties of the forward ionization wave (FIW) and restrike inside a micro‐channel that is stimulated by an atmospheric pressure plasma jet (APPJ), highlighted the effect of voltage sources, channel size, and boundary conditions on the formation mechanisms, by both the streak‐camera imaging and two‐dimensional fluid simulation. The results show that a positive FIW is triggered by the intense axial electric field, while it is initiated by the localized high electric field on the channel wall for the negative one. Meanwhile, a positive restrike is triggered by a bulk electric field generated by ion accumulation at the grounded metal surface, while the negative one originates from a sheath‐enhanced high‐field region near the wall.